1994 Yamaha 130 no reverse

[Environmental Marine Services LLC]

I have a 1994 Yamaha 130, model L130TXRS, that suddenly doesn't have reverse. Forward is fine and normal but simply no reverse, doesn't grind or do anything except not go into reverse. The propeller isn't turning at all when put in reverse. I was remiss in not changing the lower unit fluid and the fellow who runs this boat said last week that it "clunked" loudly when put in reverse. I hauled it last weekend and removed the lower unit drain plug--no oil but some water. I filled it with gear oil and it seemed fine to me in the test tank but Monday the fellow who runs it said it still "clunked" sometimes when put in reverse. Then Wednesday after running it several hours it suddenly had no reverse at all. I assume the reverse gear has gone out but it seems strange to me it doesn't grind or even try to turn the propeller. Am I correct that the reverse gear has gone out? An if so is the thing to do to get a rebuilt lower unit?

 

[racerone]

Id there freezing weather in the off season ?---If yes inspect for damage behind the prop.